Arrays常用工具类的基本使用

package day_23;

import java.util.Arrays;

/**
 * Arrays常用工具类的基本使用:
 * 1.输出
 * 2.排序
 * 3.扩容
 * 4.填充
 * 5.缩减
 * 6.二分查找(前提是数组从小到大排序)
 */
public class Test {
    public static void main(String[] args) {
        int []data={12,34,123,56,56,45,78,67};
        //  1)输出
        System.out.println(Arrays.toString(data));
        //  2)排序
        Arrays.sort(data);
        System.out.println(Arrays.toString(data));
        //  3)扩容
        data=Arrays.copyOf(data,data.length*2);
        System.out.println(Arrays.toString(data));
        //  4)填充
        Arrays.fill(data,7,16,666);
        System.out.println(Arrays.toString(data));
        //  5)数组缩减
        data=Arrays.copyOf(data,data.length/2);
        System.out.println(Arrays.toString(data));
        //  6)二分查找（前提是数组由小到大排序
        System.out.println("123的下标="+Arrays.binarySearch(data,123));
        System.out.println("56的下标="+Arrays.binarySearch(data,56));
        System.out.println("67的下标="+Arrays.binarySearch(data,67));
        System.out.println("12的下标="+Arrays.binarySearch(data,12));
        System.out.println("666的下标="+Arrays.binarySearch(data,666));
    }
}